21212334111 has 8 divisors (see below), whose sum is σ = 28285706160. Its totient is φ = 14140259072.

The previous prime is 21212334109. The next prime is 21212334127. The reversal of 21212334111 is 11143321212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212334111 - 2¹ = 21212334109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212334181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285426 + ... + 351983.

It is an arithmetic number, because the mean of its divisors is an integer number (3535713270).

Almost surely, 2^21212334111 is an apocalyptic number.

21212334111 is a deficient number, since it is larger than the sum of its proper divisors (7073372049).

21212334111 is a wasteful number, since it uses less digits than its factorization.

21212334111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648505.

The product of its digits is 288, while the sum is 21.

Adding to 21212334111 its reverse (11143321212), we get a palindrome (32355655323).

The spelling of 21212334111 in words is "twenty-one billion, two hundred twelve million, three hundred thirty-four thousand, one hundred eleven".